I bought it off e-bay at a cheaper price and now am paying the price. I've subscribed to Etisalat's (the operator) global unlimited. My pin and IMEI is registered on Etisalat's database, as confirmed by the call centre agents. However, I get edge in lowercase on my BB.

I've tried battery pulling, host routing table registration and send test pins but don't get a response back.
I have registered the device on etisalat.blackberry.net and also my e-mail address but no e-mails are being received.
I've downgraded my OS to 4.2 for 8820, still no response.
I've logged into the BIS site and tried sending service books but doesn't reach my device. Etisalat tried sending me service books but in vain.

I did a check of the items on my service book and find the following installed:
WAPBrowserConfig
WAP2Transport
WapPushConfig
Etisalat-MMS
Wifi-TCP/IP Browser
Wifi-TCP/IP Transport

I think I am missing some items in the service books but can't seem to download them to the device, as the device itself is not registering via HRT nor is receiving service books.

Would a solution be - if someone using Etisalat could backup their service books and send them to me so that I could use restore option to transfer the service books to my device?

I bought it off e-bay at a cheaper price and now am paying the price. I've subscribed to Etisalat's (the operator) global unlimited. My pin and IMEI is registered on Etisalat's database, as confirmed by the call centre agents. However, I get edge in lowercase on my BB.

I am not familiar with Etisalat's service plans... is the "global unlimited" a BlackBerry data plan? you need a BlackBerry data plan (not an "unlimited data" or "internet" plan). It MUST be a BlackBerry specific plan in order to get the service books and to be able to register via HRT.